Shortcuts to find the DETERMINANT of 3x3 matrices // Linear algebra example problems

We show several tips, tricks and shortcuts for finding determinants of matrices using examples of the determinant of 3x3 matrices.

Table of Contents:
0:00 determinants of diagonal matrices
0:50 determinant of a triangular matrix
1:41 find the determinant using cofactor expansion
4:09 determinants after swapping rows (an elementary row operation)
5: 30 determinants after scaling rows (an elementary row operation) and the transpose of a matrix